Spring scale



Nov. 29, 1927.

1,650,913 T. H. sTRAcHAN SPRING SCALE A Filed Aue. l, 1925 N I l(gvwemtoz l l l JJ. SM

e; s .1 :3,: new es we# E VM* it "l i f1 alle@ i.. lista .i all lili@.application nien .August This invent-ion relates to improvements inii'einhinp," scales ano more particularlv to imoroements in the scaleshown and `described in ihefappiieation or -.lobert "rafy Serial No.668,01, liled @stolzer 12, 192253.

The objects ot Aihe present invention reside in the provision of a scaleot the spring;l type ivhichivill be compact and simple and inexpensiveto irninuiacture and assemble. Provision is l for compensating for madethermal errors or changes in the resilient load counterbalancingn'ieelrrnisin in a simple manner.

ln the drawings,

Fie'. 1 shows an elevational view o'l incorporating my invention.

Fig. 2 shows a detail sectional vieiv taken on line 2-2 of Fig'. 1.

ln more detail the scale comprises a base having a suitable channelshaped standard 1l supported thereon and entend1 j upwardly therefromand carrying at its upper end ar bracket 12 supporting' a chart 13 etany desired Jforni. A pair of check links 141 and 15 are suitablypivotally supported upon the base. Preferably ball bearings 1G areprovided for this purpose. rlfhe platform supj oorting` member yissubstantially L-sh pcd and designated 17. rl`his member isinterconnected to the ends of the cheek links, suitable ball bearingsbeingv preferably pro-- vided as shown at 18. 'lhe platform 1Q may be otany desired torni and may be re'idly supported uponl member 1T. il..pivoti indicator 2O 'fast to the loiver check 15 and 's provided With anindex; or pointer to traverse chart r-ldjustably secured to member l? bybolts 21 a spring; fastening plate 22 to Wl.. `li the loadcounterhalancii a' or load offsetting spring is connec ed. The upper endof the load olinisetting spring is connected to a thermostaticiii-metallic bar in any suitable manner as by the stud 2f?. rEhethermostat 24 is preferably supported. upon z. sheet metal bracket plate25 which bracket is provided with a toe portion 26 to bear againststandard 11 over shoulder thereon. Screws 28 are threaded into thestandard and Ylit loosely through holes in the bracket. Other screws 29are threaded z. scale in the bracket and bear against the standard 11.By loosening` screivs'28 and advancing; screws 29 the thermostat 'may beraised to secure a. proper Zero adjustment.

lower the thermostat the operation effected in reverse manner, i. e. bytightening screws 28 and loosening screws 29. The bracket 25 preterablyhas tab portions 50 struck up thru-extrem to guide 'the thermostatic barat its sides. The bar itsel'r is secured to the bracketby a stud rlheoperation of the scale'ivill be readilyr understood as -when a load isplaced upon the platform the part 1T descends,distending spring 28 andcausing the indicator 2O to move transversely in an amount proportionalto the applied load. By adjusting plate 22 in or out the relative pointof attachment oit the loiver end of the spring 23 with respect to thestructure 17 may be varied. ln this Way the spring` can be attached at agreater or less distance from the pivot center of bearings 16 and 18.lnasinuch as part 1i" has an outward swinging movement the result ofthis adjustment will be to vary the resistance to movement or the part17 in accordance With the said adjustment. The thermostat 24 is adaptedto compensate Jrer variation in the length or thev spring` 23.

l. ii Weighing scale comprising a standard, a pair of check linkssupported thereon, and in turn supporting a load support, a thermostatiebar supported by said standard, a load counterbalancing spring connectedto said load ,support and to said therinostatie bar, and means foradjustingy the pc 4ion et the thermostatic bar "ro provide 'for ceroadjusl'niient of the scale.

ji. Weighing` coniprising` a standard, a pair of check links supportedthereon, a load support carried by said links, a therinostatic baratached to said standard, a load (':oiuiterbalanciugr mechanisminterconneoi'ine said lo'L d support and said thermostatic bar and meanstor adj Listing the position of the thermostatic bar relatively to thesupj'iorting standard to provide for Vzero adjustment of the scale.

3. A Weighing` scale comprising a standard., pair ot check linkssupported thereon, a load support carried' by said links, atherinosl'atie bar supported by said standard, a load couiiterbalancingspring interconnecting said load support and said bar and entirelysupported by said bar and. means for vai/ying` the position ot said bario provide 'for .zero adjustment ot' the scale.

4. A weighing scale comprising a standard and a lead support carriedthereby, a thermostatie member comprisinga pair of metallic barshavingdifferent eo-eliieients of expansion, a supporting member therefor andmeans for pivotally mounting said member to Said standard whereby theposition of said thermostatie member may be Varied, and a Spring`interconnecting said thermostatie member and said load support.

5. A Weighing scale comprising a standard, a pair ot links connectedthereto, a load support attached to said links, a thermostatie membereon'lprising a pair of metallic bars rigidly eonneeted together, saidbars hating dilierent eo-etlieients of expaneion, means for pivotallyattaching said bars to Said standard comprising a supporting plate andscrew means passing Vthrough said plate and cooperating with saidstandard, and a load offsetting device interconnecting said load supportand said thermostatie member.

In a Weighing' scale having a load olisetting spring and an adjustablesupporting means for said spring comprisingv a platelike member and asupport therefor, said plate-like member having a plurality etIcooperating screws adapted to conjointly eooperate with Said plate andwith the snpport therefor, one ot Said serews being tlneadedly connectedwith said support and freely passable through Said plate and another ofsaid Screws being threadedly connected with .said plate and adapted toabnt Said support, said Screws beinis)l jointl)v operable AForln'fovidiiigy a Single relative adjustn'ient between the plate and thesupport.

In tetimoiiy wliereotl l hereto aiix my signature.

THOR/IAS H. STRACHAN.

